Well, if i can recommend you one thing (And if you have money of course), get a better WC set-up. The one you actually have at the moment isn't better than a good AIR CPU cooler. I wouldn't even call this Level entry water-cooling. Or maybe i would, heh. Anyway, so yeah, if you really want to add a NB block into that loop, keep in mind that you only have a single 120mml radiator and It's a Thermaltake one... So temps will be higher. Not that much but still, under load it can make a difference depending if you are overclocking or not. Plus if you add an NB block to your MB you will have to either cut the copper (Or kind of cheap copper) piece that relies your NB heatsink to your v-reg heatsink or get an after-market v-reg heatsink. BTW: I am not 100% sure that a MCW30 block would fit this MB. Have you done your homework and looked over the net to see if it would actually fit on your particular mobo ?